Project Description
To get this right, the designer needs to understand that the tunnel wall acts as a **seal** that cuts right across the radiator's frame. The 120\text{mm} core stays in the air, and the 35\text{mm} "tank" extension stays in the water.
Here is the refined, high-detail technical brief.
## **Technical Specification: "Liberty Vault" Dual-Stage AC Tunnel**
### **1. Global Dimensions & Construction**
* **Total Length:** **14 3/8 inches (365.1mm)** from face to face.
* **Internal Bore:** **121mm x 121mm Square** (Constant from entry to exit).
* **Wall Thickness:** **4.5mm**.
* **The Joint:** Two-piece telescoping assembly with a **2-inch (50mm) overlap** at the center.
### **2. The "External Tank" Keyway (Crucial Detail)**
The radiators must be mounted so the water barbs never enter the air path.
* **The Cutout:** On the **Left Side** of the tunnel, the designer must model a vertical rectangular window measuring **31mm wide x 121mm tall**.
* **The "Pass-Through" Logic:** When the radiator is inserted into this window, the 120\text{mm} \times 120\text{mm} finned core fills the internal bore of the tunnel.
* **The External Tank:** Because the radiator has a total length of 155\text{mm}, the remaining **35\text{mm} "tank" portion** (which contains the hose barbs) will remain **protruding outside** the 3D-printed wall.
* **Sealing Lip:** Inside the tunnel, on the **top, bottom, and right-side walls**, there must be a **3mm wide recessed lip**. The radiator core seats against this lip to ensure air cannot "leak" around the edges of the radiator.
* **The Side Plate:** Provide a separate, bolt-on rectangular plate (31\text{mm} \times 160\text{mm}) that covers the insertion slot. This plate should have a cutout or "notch" that fits snugly around the neck of the radiator tanks to seal the tunnel while leaving the barbs accessible.
### **3. Linear Component Stack (Intake to Exhaust)**
**Section A: The Intake Head**
1. **Mounting Flange:** 20\text{mm} wide lip with 5\text{mm} bolt holes.
2. **Station 1 (Radiator):** The Side-Load Keyway (Tanks protruding Left).
3. **Station 2 (Plenum):** **7mm clear air gap** (No components).
4. **Station 3 (Fan):** Internal pocket for **Noctua Fan #1** (Pulling air into the vault).
5. **The Spigot:** The 50\text{mm} male end of the telescoping joint.
**Section B: The Exhaust Head**
1. **The Bell:** The 50\text{mm} female end of the telescoping joint.
2. **Station 4 (Fan):** Internal pocket for **Noctua Fan #2** (Pushing air out).
3. **Station 5 (Plenum):** **7mm clear air gap**.
4. **Station 6 (Radiator):** The Side-Load Keyway (Tanks protruding Left).
5. **Exit Nozzle:** **Full 121mm x 121mm Square opening** (No taper).
6. **Mounting Flange:** 20\text{mm} wide lip with 5\text{mm} bolt holes.
### **4. Fluid & Moisture Management**
* **Drainage Slope:** The bottom floor of the tunnel must have a **2-degree pitch** tilting toward the intake end.
* **Weep Holes:** A **3mm drainage hole** must be modeled at the lowest floor point of each section.
* **Drip Rails:** A **2mm high "speed bump" ridge** on the floor just before each fan pocket to prevent condensation from sliding into the fan electronics.
### **Summary for the Designer:**
The goal is a **completely dry air path**. By having the radiator tanks stick out of the side of the 3D print, the 800L/H pump can be plumbed in the ice water without any hoses or fittings cluttering the internal air tunnel.
This design maximizes the **Static Pressure** of the Noctuas by keeping the bore perfectly square and unobstructed by plumbing.